On day #1 of the movie, Linda's husband dies. The oldest daughter should have stitches on her face having gone through the glass sliding door while her father was alive earlier that week. But her face is completely clear, no scarring, no stitches.
After Jim takes the kids to school and confirms with Claire he is not meeting her, he calls Linda at home to say he wants to work things out. Linda is calling him and Jim looks at his phone and sees she is calling. The time on the phone is 3:45 pm. Yet this is all suppose to be first thing in the morning.
When Linda approaches the garbage can to grab the missing page from the Yellow Book, the phone on the desk nearby is positioned diagonally, with the antenna pointed towards the trash can, and the scene cuts to a different focus. When it cuts back and she reaches for the phone, the antenna is pointing the other way.
When Linda is about to get the injection, Dr. Roth is first on her right side then when the camera goes to a further view, he's seen on her left side. Then when he actually gives her the injection, he's on her right side again.
When Linda is writing out the calendar, and adds the red "CUTS" element to Tuesday, you can see a red entry on the adjacent-to-the-right day (Wednesday). But when the camera again looks in from the top, Wednesday is clear.
When Linda is writing out the calendar of how each day has played out, she writes a large 'T' for Tuesday that extends into the Monday frame. The next time the camera shows this particular day, the 'T' is much smaller.
When Linda is writing what happened on the days of the week, you can see that right before she writes what happened on Wednesday she is holding the dark marker, but when she writes what happened on Wednesday she writes with the red marker.
As Linda start with the calendar, she counts to seven, indicating that she makes seven lines. With seven days, you would only need six lines, and when the calendar is shown, there are in fact only six lines.
Modern repair of facial injuries would not involve large black thread as used on the daughter, especially on a young child. Deep suturing, skin adhesives, dissolvable clear thread and other techniques would both minimize future scaring and reduce the visual impact whilst healing.
When Dr. Roth comes to take Linda away on the day of the funeral, her mother is heard asking Linda to tell them what happened to Bridgette's face. As the cuts occurred prior to Jim's death, she should already know what happened, although Linda would not due to her not having lived through that day yet.
When Bridget runs through the glass door, the glass breaks into fairly large pieces which lacerates her severely. However, later on when Jim Hanson is cleaning up the glass, the glass appears to be pebble like with some still dangling from the top of the door. Pebble like glass fragments indicate that the glass is a tempered PVB laminated safety glass, which could not have injured Bridget to the extent of her injuries in the movie.
The goof items below may give away important plot points.
Errors in geography
The accident that killed Jim occurred at mile marker 220 on US Highway 57.
This is impossible, because US 57 only exists between Eagle Pass, Texas, and Moore, Texas, which is a total distance of 101 miles.
(Possibly intentional by the filmmakers) When Linda visits Mile 220 the first time, she's abruptly interrupted in her standing-in-the-middle-of-the-road reverie by a Lincoln Town Car swerving around her and honking. When Jim meets his destiny at that same location later in the film, the car that swerves around him during his U-turn, causing him to stall in the middle of the road, is a Lincoln Town Car.
On Thursday, the day Linda finds out about Jim's death, Bridgette is seen with no cuts on her face. As the movie progresses and Linda goes back in time, we see that Bridgette actually got her cuts while her husband is still alive.